:root{
  --bg:#f6f7f3;
  --surface:#ffffff;
  --text:#1e2a22;
  --muted:#637067;
  --brand:#2f6b4f;
  --brand-dark:#214d39;
  --accent:#dfeadf;
  --line:#dde3dc;
  --shadow:0 10px 30px rgba(31,55,42,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1120px,92%);margin:auto}
.topbar{
  background:#173828;color:#fff;font-size:.9rem;text-align:center;padding:.45rem 1rem;
}
header{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 0;
}
.brand{display:flex;align-items:center;gap:.65rem;font-weight:800;font-size:1.15rem}
.logo{
  width:40px;height:40px;border-radius:12px;background:var(--brand);
  color:#fff;display:grid;place-items:center;font-size:1.2rem;
}
.navlinks{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.navlinks a{font-weight:600;color:#344238;font-size:.95rem}
.navlinks a:hover{color:var(--brand)}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:.55rem .75rem;font-size:1rem}
.hero{padding:5.5rem 0 4rem}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:2rem;align-items:center}
.eyebrow{color:var(--brand);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.8rem}
h1{font-size:clamp(2.5rem,5vw,5rem);line-height:1.02;margin:.5rem 0 1rem;letter-spacing:-.04em}
h2{font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.1;letter-spacing:-.025em;margin:0 0 .7rem}
h3{line-height:1.2}
.lead{font-size:1.15rem;color:var(--muted);max-width:780px}
.cta-row{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;border-radius:12px;
  padding:.85rem 1.1rem;font-weight:800;border:1px solid var(--brand);
}
.btn.primary{background:var(--brand);color:#fff}
.btn.secondary{background:#fff;color:var(--brand)}
.hero-panel{
  background:linear-gradient(145deg,#214d39,#3d7a5d);color:white;border-radius:28px;
  padding:2rem;box-shadow:var(--shadow);min-height:360px;display:flex;flex-direction:column;justify-content:space-between;
}
.hero-panel .metric{display:flex;justify-content:space-between;border-top:1px solid rgba(255,255,255,.2);padding-top:1rem;margin-top:1rem}
.section{padding:4rem 0}
.section.alt{background:#eef2ec}
.section-head{display:flex;justify-content:space-between;gap:1rem;align-items:end;margin-bottom:1.8rem}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem;
  box-shadow:0 4px 18px rgba(28,45,34,.04);transition:.2s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.icon{font-size:1.8rem}
.card p{color:var(--muted);margin:.35rem 0 0}
.tag{display:inline-block;background:var(--accent);color:var(--brand-dark);font-size:.78rem;font-weight:800;padding:.25rem .55rem;border-radius:999px}
.article-list{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.article-item{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:1.2rem;
}
.article-item small{color:var(--muted)}
.tool{
  background:#173828;color:white;border-radius:24px;padding:2rem;
}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}
.calc{
  background:#fff;color:var(--text);padding:1.4rem;border-radius:16px;
}
label{display:block;font-size:.88rem;font-weight:700;margin-top:.7rem}
input,select{
  width:100%;padding:.75rem;border:1px solid var(--line);border-radius:10px;margin-top:.25rem;font:inherit;
}
.result{margin-top:1rem;background:#eef6ef;border-radius:12px;padding:1rem;font-weight:800}
.footer{background:#142219;color:#dbe5dd;padding:2.5rem 0;margin-top:2rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}
.footer a{color:#dbe5dd}
.breadcrumbs{font-size:.9rem;color:var(--muted);margin:1.4rem 0}
.content{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:2rem;align-items:start}
.article{
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:2rem;
}
.article h1{font-size:clamp(2rem,4vw,3.4rem)}
.article h2{margin-top:2rem}
.sidebar{position:sticky;top:90px}
.note{
  border-left:4px solid var(--brand);background:#eef6ef;padding:1rem 1.1rem;border-radius:8px;margin:1.2rem 0;
}
.disclaimer{font-size:.86rem;color:var(--muted)}
@media (max-width:850px){
  .hero-grid,.tool-grid,.content,.footer-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr 1fr}
  .article-list{grid-template-columns:1fr}
  .navlinks{display:none;position:absolute;left:4%;right:4%;top:74px;background:#fff;padding:1rem;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
  .navlinks.open{display:flex;flex-direction:column;align-items:flex-start}
  .menu-btn{display:block}
  .sidebar{position:static}
}
@media (max-width:560px){
  .grid{grid-template-columns:1fr}
  .hero{padding:3.5rem 0 2.5rem}
}